(0 19 2)(1 5 3)(4 11 7)(6 15 13)(8 17 9)(10 14 12)(16 20 18)
ALLOWS (11/8)-SEQUENCE
1: (6 15 17)

(0 19 2)(1 5 3)(4 11 7)(6 9 8 17 13)(10 14 12)(15)(16 20 18)
2: (6 9 13)

(0 19 2)(1 5 3)(4 11 7)(6)(8 17 13)(9)(10 14 12)(15)(16 20 18)
3: (4 11 7)

(0 19 2)(1 5 3)(4)(6)(7)(8 17 13)(9)(10 14 12)(11)(15)(16 20 18)
4: (10 14 12)

(0 19 2)(1 5 3)(4)(6)(7)(8 17 13)(9)(10)(11)(12)(14)(15)(16 20 18)